2012MNRAS.425..709M

Query : 2012MNRAS.425..709M

2012MNRAS.425..709M - Mon. Not. R. Astron. Soc., 425, 709-719 (2012/September-1)

A unique isolated dwarf spheroidal galaxy at D=1.9Mpc.

MAKAROV D., MAKAROVA L., SHARINA M., UKLEIN R., TIKHONOV A., GUHATHAKURTA P., KIRBY E. and TEREKHOVA N.

Abstract (from CDS):

We present a photometric and spectroscopic study of the unique isolated nearby dwarf spheroidal (dSph) galaxy KKR25. The galaxy was resolved into stars with Hubble Space Telescope/Wide Field Planetary Camera 2 including old red giant branch and red clump. We have constructed a model of the resolved stellar populations and measured the star formation rate and metallicity as a function of time. The main star formation activity period occurred about 12.6–13.7 Gyr ago. These stars are mostly metal poor, with a mean metallicity [Fe/H] ∼ -1 to -1.6 dex. About 60per cent of the total stellar mass was formed during this event. There are indications of intermediate-age star formation in KKR25 between 1 and 4 Gyr with no significant signs of metal enrichment for these stars. Long-slit spectroscopy was carried out using the Russian 6-m telescope of the integrated starlight and bright individual objects in the galaxy. We have discovered a planetary nebula (PN) in KKR25. This is the first known PN in a dSph galaxy outside the Local Group. We have measured its oxygen abundance 12 + log(O/H) = 7.60±0.07 dex and a radial velocity Vh= -79 km/s. We have analysed the stellar density distribution in the galaxy body. The galaxy has an exponential surface brightness profile with a central light depression. We discuss the evolutionary status of KKR25, which belongs to a rare class of very isolated dwarf galaxies with spheroidal morphology.

Deceased.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS

Journal keyword(s): galaxies: distances and redshifts - galaxies: dwarf - galaxies: individual: KKR25 - galaxies: stellar content

Nomenclature: Fig. 2, Table 5: [MMS2012b] N (Nos 1-4).

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
3 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
4 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
5 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
6 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
7 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
8 GALEX J035343.7-000434 WD* 03 53 43.6724346528 -00 04 33.812497416 14.280 15.391 15.606 15.725 15.906 DA1.5 43 0
9 HD 284227 * 04 15 39.3608474064 +23 45 18.966136068   11.09 10.36     F8 6 0
10 HD 284364 SB* 04 23 16.6707907800 +23 30 25.131781476   11.75 10.95     F8 5 0
11 HD 284531 * 04 34 06.6876187536 +23 19 00.527480904   11.1 10.4     G0 11 0
12 HD 284741 * 04 52 07.9973743920 +24 02 59.131863924   11.60 10.85     G0 6 0
13 BD+23 992 * 05 40 31.2780315984 +23 59 36.954809376   10.62 10.26     ~ 1 0
14 BD+75 325 HS* 08 10 49.4903003712 +74 57 57.931973676 8.002 9.23 9.50 9.698 9.884 sdO5 267 0
15 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
16 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
17 NAME HVC Complex M HVC 10 48.2 +48 00           ~ 84 0
18 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
19 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 94 0
20 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
21 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
22 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 456 0
23 [MMS2012b] 3 QSO 16 13 46.4853743976 +54 21 45.034475652           ~ 1 0
24 [MMS2012b] 4 PN 16 13 47.2 +54 22 39           ~ 1 0
25 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 115 0
26 [MMS2012b] 2 G 16 13 49.3 +54 22 06           ~ 1 0
27 [MMS2012b] 1 * 16 13 50.0 +54 22 01           ~ 1 0
28 NAME Local Void vid 18 38 +18.0           ~ 234 0
29 LAWD 87 WD* 21 32 16.2327040616 +00 15 14.399267982 13.717 14.634 14.674 14.675 14.676 DB4 195 1
30 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
31 LEDA 2807157 GiG 23 45 35.177 +38 43 05.09   16.7 15.2     ~ 93 1
32 NAME Local Group GrG ~ ~           ~ 9325 0

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